JP2620626B2 - Method of manufacturing filtration tube for filtration device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for producing a filter tube of a filtration device for cleaning pollutants such as a plating solution.

<Prior Art> In a filter tube having a filter material such as a fiber material or a cloth material provided on an outer peripheral surface thereof, if the filter material is clogged by a filtered material, the filter material is conventionally discarded and replaced with a new one. The filter had been replaced.

As a means for cleaning the clogging of the filter medium, a method in which the cleaning liquid once purified by the filter medium is caused to flow backward by a pump for cleaning is also conceivable. However, in this method, the control of the supply time and the supply amount of the cleaning liquid is troublesome, and furthermore, the cleaning liquid obtained by the angle filtration is used in a large amount, and has many disadvantages such as wastefulness. For this reason, this method cannot be said to be appropriate, and after all, the filter tube is disposable at present.

In order to eliminate such a drawback, the present inventor has provided one or a plurality of filter cylinders having the inside communicating with the outlet in a tank provided with a supply port for the liquid to be treated and an outlet for the cleaning liquid. ,
A filtration device that communicates the inside with the outlet is proposed.

In this filtration device, when a liquid to be treated is supplied from a supply port into a tank and a filtering operation is performed, a filtering action is generated by a filter medium of a filter cylinder, and the liquid to be treated is filtered through the filter medium to become a clean liquid. It is discharged from the exit.

An object of the present invention is to provide a manufacturing method which is most suitable for manufacturing a filter cylinder in such a filtering device.

<Means for Solving the Problems> The present invention provides a filter medium made of a thermoplastic fiber material around the outer surface of a long coil, and the upper end thereof is used as a lip.
At the lower end, there is a filter tube having a plug material made of a thermoplastic resin disposed therein, and the plug material is heated, and the filter material is applied, so that the peripheral surface of the plug material and the filter material are welded on the surface to be applied. Further, the filter material is sealed by heating and welding a filter material at a lower portion thereof.

<Example> An example of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows an example of a filtration device using a filtration tube 30 manufactured by the method of the present invention.

Here, reference numeral 1 denotes a tank, which is covered with an arc-shaped bulging lid frame 3 on the upper surface of a tubular body 2 having a flange formed on the upper portion and is fixed with bolts 4. Has a bottom frame 5 fitted outside. A liquid flow path 6 is formed between the inner peripheral surface of the bottom frame 5 and the peripheral surface of the tubular body 2.
Is provided with a supply port 7 communicating with the liquid flow path 6. The supply port 7 communicates with an inflow pipe 9 that is opened and closed by an on-off valve 8. A drain port 10 controlled to be opened and closed by an on-off valve 11 is provided at the lower bottom of the bottom frame 5. Further, a liquid recovery port 17 is provided at an upper portion of the tubular main body 2.

A locking projection 2a is formed on the upper inner surface of the tubular main body 2, and a mounting plate 13 formed with a plurality of connection holes 12 into which the elastic filter tube 30 is inserted from above is formed on the locking projection 2a. It is on board.

The filter tube 30 is provided on the outer peripheral surface of the long coil 31 with Tetron (registered trademark), polypropylene, and Teflon (registered trademark).
A filter medium 32 made of a thermoplastic fiber material is provided around the coil 31 at the upper end thereof, and the coil 31 is densely enlarged to form a lip 33.At the lower end, a plug material made of a thermoplastic resin such as polypropylene is used. 34 is provided, and the edge of the filter medium 32 is welded to the lower surface thereof. Thus, an elastic filter tube 30 having an open upper end and a lower end closed and having elasticity in the longitudinal direction is configured. The filter cylinder 30 may be of various shapes such as a relatively thin one having a length of 500 mm and an outer diameter of 12 mm.

The number of the filter tubes 30 can be one to several hundreds corresponding to the required processing capacity.

The filter tube 30 is inserted into the connection hole 12 from above, and
33 is hung around the connection hole 12 periphery. And mounting board
A holding plate 15 having a through-hole 14 vertically aligned with the connection hole 12 is attached on 13 and is connected to each other by bolts 16.

A cleaning liquid reservoir 23 is formed between the holding plate 15 and the lid frame 3 and communicates with an outlet 24 provided at the upper end of the lid frame 3. That is, the outlet 24 communicates with the inside of each filter tube 30 via the connection hole 12 and the through hole 14.

In addition, a pipe 25 is connected to the outlet 24. The conduit 25 is provided with an on-off valve 26 for controlling the flow of the cleaning liquid and a switching valve 28 for controlling switching to a pressure air source 27 for generating pressurized air.

 Next, the filtration operation of the filtration device will be described.

When the processing liquid flows from the supply port 7 by opening the on-off valve 8 and the on-off valve 26, the processing liquid flows into the tank 1 from the inlet hole 6. The treatment liquid permeates through the filter medium 32 and flows into each of the filtration tubes 30, and undergoes a filtering action to become a cleaning liquid. The filter tube 30
The cleaning liquid filtered by the filter medium 32 of
After 25, it flows out to the required part. During this filtering operation, the filter tube 30 is in a contracted state by a pressure from below as shown in FIG.

In such a filtration operation, a filter aid is supplied in advance from the supply port 7 to form a filter aid layer on the surface of the filter medium 32,
The filter aid layer and the filter medium 32 may cause a filtering action.

When the filtration operation is continued, a filter layer is formed on the surface of the filter medium 32, and the filter medium 32 is clogged, and the water pressure in the tank 1 increases. This pressure increase is detected by a known pressure detecting means, and the next backwashing step is started.

That is, first, the on-off valve 8 and the on-off valve 26 are closed, the drain port 10 or the liquid recovery port 17 is opened, and further, the switching valve 28 is switched, so that the gauge pressure of 1 to 1.8 kg / cm ^{2 is} supplied from the pressure air source 27.
A certain amount of pressurized air is communicated with the outlet 24.

Then, the cleaning liquid in the liquid reservoir 23 and the filter cylinder 30 is discharged from the filter medium 32 by the pressure. At this time, since the internal pressure of the filter cylinder 30 becomes larger than the surrounding water pressure, the coil 31 contracted during the filtering process expands vertically as shown in FIG. 2. For this reason, the filter layer x
Is formed, the layer x is cracked and peeled off, flows out with the jet of the cleaning liquid, and is cleaned. The liquid after the cleaning is discharged from the drain port 10 or the liquid recovery port 17.

In the above-described embodiment, by selectively filling various materials such as activated carbon, glass fiber, and ion exchange resin into each filter tube 30, the filtering action is optimized to suit the characteristics of the processing solution. It becomes possible.

Next, a method of manufacturing the filtration tube 30 applied to the above-described filtration device and the like will be described.

As shown in FIG. 3A, first, the lower part of the long coil 31 is closely fitted to the upper step edge 35 of the plug material 34 made of a thermoplastic material such as polypropylene, and a long cylinder made of a thermoplastic fiber material such as polypropylene. The filter medium 32 in a shape of is applied. In this attached state, the plug material 34 is exposed from the filter medium 32, the plug material 34 is fitted into the heating groove 41 of the heating body 40 conforming to the peripheral shape of the plug material 34, and the surface is melted. Heat to Next, the plug material 34 is removed from the heating groove 41, and the filter medium 32 is lowered as shown in FIG. 3B, and the lower edge of the filter medium 32 is projected below the plug material 34. Then, the lower inner peripheral surface of the filter medium 32 is brought into contact with the plug material 34, and the plug material 34
Due to this heat, the inner peripheral surface of the filter medium 32 is welded. Next, as shown in FIG.
Press on the heated surface of. As a result, the edge of the filter medium 32 is melted and joined to the lower surface of the plug 34 as shown in FIG.

 Thus, the lower part of the filter tube 30 is sealed.

Next, an example of means for joining the coil 31 and the filter medium 32 at the lip 33 will be described with reference to FIG.

The coil 31 has an enlarged diameter portion 36 formed at the upper end thereof in advance as shown in FIG. Then, in the joined state of the lower end of FIG. 3, the edge of the filter medium 32 is projected upward as shown in FIG. 4B, and the projected edge is heated. By this heating, the edge of the filter medium 32 shrinks due to heat as shown in FIG. In this state, a processing tool 42 having a vertical pressing projection 43 is fitted from above as shown in FIG.
The end of the plug 34 is inserted into the enlarged diameter portion 36 by the pressing projection 43. Next, as shown in FIG. 4E, a processing tool 44 having an inclined projection 45 is fitted into the upper end of the coil 31, and the filter medium 32 is brought into close contact with the enlarged diameter portion.

Thus, the filter medium 32 comes into close contact with the upper edge of the coil 31, and the filter tube 30
The lip 33 is formed.

<Effects of the Invention> As described above, the present invention forms the filter material 32 and the plug material 34 from a thermoplastic material, and heats the plug material 34 to bring the filter material 32 into contact with the filter material 32. The filter tube 30 is welded on its peripheral surface and lower surface, and has an excellent effect that the filter tube 30 having a special shape that is difficult to process can be easily manufactured.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a filtration device, and FIGS.
FIG. 4 is an enlarged vertical cross-sectional side view showing the expansion / contraction action of the helical member. 3 and 4 show a manufacturing process of the filter tube 30, FIG. 3 is a process diagram showing a sealing means below the filter tube 30, and FIG. 4 is a process diagram showing a means for forming a lip 33 of the filter tube 30. FIG. 1; tank, 6; inlet hole, 7; supply port, 10; drain port, 17; liquid recovery port, 24; outlet, 30; filter cylinder, 31; coil, 32; filter medium,
33; lip, 34; plug, 40; heating element, 42, 44; processing tool

Claims (1)

(57) [Claims] 1. A filter medium made of a thermoplastic fiber material is provided around an outer peripheral surface of a long coil, and an upper end thereof is used as an edge.
The lower end is provided with a plug material made of a thermoplastic resin, and is provided vertically in a tank having a supply port for the liquid to be treated and an outlet for the cleaning liquid, and communicates the inside with the outlet. In the filter tube, heating the plug material, welding the peripheral surface of the plug material and the filter material by applying the filter material, and further sealing by heating and welding the filter material at the lower part. Method for producing a filter tube of a filtration device.